update-all: create update-all subcommand

The 'update-all' subcommand runs the 'update' subcommand on all
registered routes.

cmd/git-bundle-server/subcommand.go

@@ -9,5 +9,6 @@ func all() []Subcommand {
 	return []Subcommand{
 		Init{},
 		Update{},
+		UpdateAll{},
 	}
 }

cmd/git-bundle-server/update-all.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"fmt"
+	"git-bundle-server/internal/core"
+	"os"
+	"os/exec"
+)
+
+type UpdateAll struct{}
+
+func (UpdateAll) subcommand() string {
+	return "update-all"
+}
+
+func (UpdateAll) run(args []string) error {
+	exe, err := os.Executable()
+	if err != nil {
+		return fmt.Errorf("failed to get path to execuable: %w", err)
+	}
+
+	repos, err := core.GetRepositories()
+	if err != nil {
+		return err
+	}
+
+	for route := range repos {
+		cmd := exec.Command(exe, "update", route)
+		cmd.Stderr = os.Stderr
+		cmd.Stdout = os.Stdout
+
+		err := cmd.Start()
+		if err != nil {
+			return fmt.Errorf("git command failed to start: %w", err)
+		}
+
+		err = cmd.Wait()
+		if err != nil {
+			return fmt.Errorf("git command returned a failure: %w", err)
+		}
+	}
+
+	return nil
+}